JPS5830064Y2 - Sewing machine bobbin winding switching device that moves when the bobbin is loosened - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sewing machine bobbin winding switching device that is linked to the insertion and removal of a bobbin.

Conventional handwheel idling devices in sewing machines, in which the upper shaft rotation stops to operate the bobbin winding device during the bobbin thread winding operation, and only the handwheel automatically idles, can cause the user to mistakenly think that the handwheel is idling. If the motor controller was stepped on in this state, the upper shaft would rotate and the needle would move up and down, which was dangerous.

The present invention was proposed in order to eliminate the above-mentioned conventional drawbacks, and aims to instantly disengage the upper shaft from the drive pulley by inserting the bobbin into the bobbin shaft. The bobbin shaft cannot be connected to the drive pulley unless the bobbin is inserted into the bobbin, so there is no chance of accidentally rotating the bobbin shaft. It also features a cam lever that allows the bobbin to be inserted no matter what position the cam bush claw is in. It also has a sewing machine bobbin winding switching device that is linked to bobbin insertion/removal. This is what we intend to provide.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, an arm cover 2 is fixed to the upper surface of a sewing machine arm 1,
A boss 3 is provided inside the arm lid 2, and a bobbin shaft main body 4 is rotatably attached to the boss 3 by a stepped screw 5.

Further, at the tip of the bobbin winding shaft main body 4, there is a rotary receiver 7 for the bobbin winding shaft 6,
A bearing 9 integrally having a detection terminal 8 is provided in the center thereof, and a pincushion detection stopper 45 is provided on the inner surface of the arm lid 2 at a position in contact with the detection terminal 8.
is always lifted upward by a compression spring 10, and its upper limit is limited by a pin 11.

Moreover, the central notch 12 of the rotary receiver 7 serves as a rotation stopper for the detection terminal 8 and as a vertical slide groove.

As shown in FIG. 2, there is a stopper spring 14 in the upper center of the bobbin winding shaft 6 to prevent the rotation of the bobbin 13.
3 is inserted into the bobbin shaft 6, the bobbin 13 is held by the stopper spring 14 engaged with the notch 15.

Also, below the bobbin winding shaft 6 is a pulley 1 integrated with a rubber roller 16.
7 is attached, and a pin 18 for stopping the bobbin winding shaft 6 from being removed is fixed to the rotating receiver 7 slightly above the pin 18.

19 is a detection lever provided with a receiving part that engages with the tip of the detection terminal 8 and satisfies the rotation range of the detection terminal 8;
20 so as to be rotatable, and is always urged upward by a spring 21.

Further, as shown in FIG. 3, a spring 23 is inserted into the shaft 20 and installed between the detection lever 19 and the cam lever 22, so that the cam lever 22 and the detection lever 19 are always integrated. A convex portion 25 is provided on a portion of the detection lever 19 so that the cam lever 22 only rotates in one direction.

Further, a spring hook 26 is provided at the other end of the rotation receiver 7, a spring hook 27 is provided inside the arm lid 2, and a quick motion spring 28 is attached between these.

Further, a rotation stopper 29 of the rotation receiving body 7 protrudes from the inner surface of the arm lid 2.

Reference numeral 30 denotes an upper shaft provided at the upper part of the arm 1, and a clutch bush 32 integrated with a pin 31 is attached to the tip end of the upper shaft.
is provided, and acts as a clutch between the drive pulley 33 and the drive pulley 33 as described later.

34 is a clutch boss integrated with the drive pulley 33;
4 and the outer periphery of the clutch bushing 32, a spring clutch 37 is inserted, one end of which is fixed to a groove 35 of the bushing 32, and the other end of which is fixed to a cam bushing 36 coaxial with the upper shaft 30.

Also, the pulley 33, clutch boss 34, spring clutch 37 and cam bush 36 are attached with resin washers 38 from both sides.
and is held at a specified position by a spring 39.

Further, a flywheel 40 is attached to a nut 4 at the leading end of the upper shaft 30.
1, and the outside thereof is covered by a blind plug 42, and a bobbin winding completion stopper 43 is fixed to the upper surface of the arm lid 2.

Further, 44 is a claw of the cam bush 36. Next, to explain the operation, in FIGS. 1 and 2, FIG. 1 shows the state when the clutch is engaged (normal sewing state), and FIG. 2 shows the state when the thread is wound (declutch state).

As shown in FIG. 2, when the bobbin 13 is first inserted into the bobbin shaft 6, the compression spring 10 is compressed and the bearing 9 moves downward.

At this time, the bobbin 13 is opened by the opening pressure of the stopper spring 14, which causes the spring 14 to open at the notch 15 of the bobbin 13.
It is held on the bobbin winding shaft 6 because it bites into the thread.

Also, as the bearing 9 moves downward, the detection terminal 8 pushes down the tip of the detection lever 19, and as shown in FIGS. 2, 3, and 4, this pushing down force is transmitted to the cam lever 22 via the spring 23. The tip of the cam lever 22 is lowered and the claw 4
4 to try to stop the cam bushing 36 as shown in FIG.

Therefore, since the tip of the spring clutch 37 fixed to the cam bush 36 is fixed, the clutch boss 34 to which rotation is transmitted from the pulley 33 side is connected to the spring clutch 3
A gap is formed on the inner surface of the clutch 7, causing it to spin idly and disengaging the clutch.

At this time, when the bobbin winding shaft 6 is rotated in the direction of the pulley 33, the rubber roller 16 hits the side surface of the pulley 33 and begins to transmit rotation (FIG. 4).

Further, the end of winding the thread on the bobbin 13 is detected by a thread winding completion stopper 43 set on the upper surface of the arm lid 2.

When the bobbin winder is not in use, the detection terminal 8 is in contact with the bobbin winding detection stopper 45 provided on the inner surface of the arm lid 2, so the bobbin winding shaft 6
cannot rotate in the direction of the pulley 33, and when the bobbin 13 is inserted into the bobbin winding shaft 6, the detection terminal 8 is lowered via the bearing 9, transmitted from the detection lever 14 to the cam lever 22, and engaged with the pawl 44. The clutch will disengage.

As explained in detail above, according to the present invention, the flywheel motion can be easily switched to idling or upper shaft drive by inserting and removing the bobbin from the bobbin winding shaft, and this switching operation is carried out via the spring clutch mechanism using the detection lever. This can be done extremely smoothly only by the frictional action of the spring that operates the cam lever and the cam lever in the same way.

Therefore, the present invention does not require the effort of loosening and tightening the flywheel tightening screws one by one as in the conventional device, and moreover, the bobbin winder can be connected to the bobbin winder by only one operation of raising and lowering the bobbin. This is extremely simple and has great practical effects.

Furthermore, since the flywheel is in an idling state from the moment the bobbin is inserted into the bobbin winding shaft, it is safe because even if the motor controller is accidentally stepped on, the upper and lower shafts will not rotate.

Furthermore, since the bobbin winding detection stopper is provided, the bobbin winding shaft cannot be rotated toward the drive boot unless the bobbin is inserted into the bobbin winding shaft.

Therefore, there is no risk of accidentally driving the sewing machine while the rubber roller and drive pulley are in contact with each other, and it is possible to prevent the rubber roller from deforming during transportation or storage when not in use.

[Brief explanation of the drawing]

1 and 2 are front sectional views showing an embodiment of the present invention in different operating states, FIGS. 3 and 4 are plan sectional views showing different operating states, and FIG. 5 is a side sectional view. Explanation of main parts of the diagram 1... Sewing machine arm, 2
・・・・・・Arm lid, 4・・・・Bottom winding shaft body, 6
・・・・・・Bottom winding shaft, 7・・・Rotation receiver, 8...
...Detection terminal, 9...Bearing, 10...
...Compression spring, 13...Bobbin, 14...
...Stopper spring, 19...Detection lever, 21...Spring, 22...Cam lever, 23...Spring, 30...Top axis, 32
...Clutch bush, 33...Drive pulley, 34...Clutch boss, 36...
...Cam bush, 37... Spring clutch, 40... Flywheel, 44... Cam bush pawl, 45... Stopper.

Claims (1)

[Scope of utility model registration request] A bobbin shaft body is rotatably attached to the arm body, a rotating receiver is attached to the bobbin spindle body, and a bobbin is inserted into the central portion of the rotating receiver and protruding from the arm body. In this case, by inserting and removing the bobbin provided on the inner surface of the arm lid into the pincushion shaft and the pincushion shaft that maintains the inserted state, the detection terminal is lowered and raised via the bearing, and the shape is such that it can be engaged with and detached from the detection terminal. a bobbin winding detection stopper, which is vertically movably fitted between the outer periphery of the bobbin shaft and the rotary receiver, is constantly biased upward, and is movable downward when the bobbin is inserted; a bearing having a detection terminal on the arm body, the bearing being pivotably supported on the arm body so as to be able to rotate up and down, and having a receiving portion that is always biased upward and that satisfies the rotation range of the detection terminal; A detection lever that is pressed down when the cam lever is lowered, a cam lever that is engaged via a spring to perform the same operation as the detection lever, a cam bushing coaxial with the upper shaft that is provided with a pawl that engages with the cam lever when the cam lever is lowered; A spring clutch mechanism is provided between the cam bushing and the drive pulley, and between the cam bushing and the upper shaft having a flywheel, for engaging and disengaging the drive between the drive pulley and the upper shaft, and the spring clutch mechanism is provided to determine at which position the pawl of the cam bushing stops. In the case where a bobbin is inserted into the bobbin winding shaft, the pawl and the cam lever are engaged while the upper shaft rotates by an angle between the pawls of the cam bush with respect to the center of the upper shaft, A sewing machine bobbin winding switching device that is linked to insertion and removal of a bobbin, characterized in that the spring clutch mechanism is released to allow the drive pulley to rotate idly.